Re: Oracle and SAN

>From your perspective a SAN is nothing more than a bunch of disks
connected to a computer. Just like a traditional direct-attach disk array. The only difference is you are connecting to the disk via Fibre vs. SCSI. You can configure a SAN just as poorly as you can configure a direct-attached disk array.

Usually the difficulty with Oracle on SAN's is the storage administrators don't understand what the database host needs. They'll share your disk with the email server. When your server is doing very little I/O you'll be getting service times in the 40's.

They'll give you 6 physical disks in a RAID 5 filesystem but present it as 8 LUNs so you think you have 8 RAID 5 filesystems.

They'll tell you they have hardware RAID and lots of cache so RAID 5 is as fast enough for your redo logs. Received on Thu Jul 21 2005 - 08:26:34 CDT